The geology of the greater Arcadia area is dominated by greenstone lithologies of the Arcturus Formation of the Harare Greenstone Belt (HGB). These greenstones are encircled and intruded by a variable suite of granitic rocks, the oldest of which may have been intruded at a similar time with the youngest felsic volcanic rocks of the belt. There is also some evidence for a small remnant area of gneissic basement to the greenstone belt.
The HGB takes the form of a complex refolded synform structure, which outcrops in two major limbs.
The E-W trending Arcturus Limb occupies a broad band across the centre of the area, and to the west of the city of Harare this passes via a fold closure into the N-S trending Passaford Limb which is contiguous northwards to the greenstones of the Bindura area.
The main HGB lithological units comprise mainly meta-basalts, banded iron formations, metaandesites, serpentinites, dolerites and the lithium bearing pegmatites that also host beryl, tin and tantalite amongst others.
Four different rock types are found on the Arcadia and Green Mamba claims. These are metabasalt, pegmatite, dolerite and quartz veins, listed from relatively oldest to youngest. The pegmatites comprise the lithium bearing rocks and are of immediate relevance to the Project.
Pegmatite outcrops are coarse to very coarse grained, white to greyish white in colour and blocky in appearance with some oxidation along joint planes. How ........
